Metallogenic Regularity And Genesis Of Copper-molybdenum Deposits In Songkarsu Area,Xinjiang

The copper molybdenum deposit in songkaersu area of xinjiang is located in the eas tern quasi-karamely area of xinjiang,which is part of the Paleozoic orogenic belt of east ern junggar.On the basis of field investigation,this paper fully find out the copper and molybdenum in loose cut,Sue area of xinjiang regional geological background,geologica l characteristics and ore deposit geological characteristics,ore deposit for the fluid inclusi ons and isotopic geochemistry research,find out the composition of ore-forming fluid an d ore-forming fluid evolution process,has been clear about the deposit formation.The st rata exposed in the study area are mainly devonian and carboniferous,and a small amou nt of Jurassic is exposed in the south of the study area.The upper Paleozoic is intermed iate-acid volcanic rock,its clastic rock and carbonate rock,and the Mesozoic is continent al clastic rock.Regional fold and fault structures are well developed and the general dire ction of tectonic lines is nw-se.The metallogenic background is in the closed collision state of the late early carboniferous sea basin,which is followed by fold orogenesis and magma intrusion,and finally forms a specific type of minerals distributed in the fold b elt.The continuous emergence of orogeny has brought the eruption of continental volcani c rocks,the development of volcanic mechanism,and the shallow formation of low-temp erature hydrothermal gold deposits with a good material basis,and provided a very favor able ore-bearing structure for the symbiotic porphyry of songkelsu copper molybdenum or e mineralization.Microscopical temperature measurement results of fluid inclusions in the copper and molybdenum deposits in songkale area show that the hydrothermal fluid evolution process of the mineralized porphyry bodies in songkale copper mine has obvious regularity,whi ch means that the temperature and salinity will change and continue to decrease in differ ent periods.Mineralization is a continuous process and the corresponding fluid inclusions are analyzed by laser Raman probe.The final result reflects that the main component o f inclusions is carbon dioxide,and other inclusions include CH₄.This result also represe nts that the gas phase composition of inclusions in quartz at different periods in the who le region is composed of CO₂ and CH₄.The results of hydrogen and oxygen isotope in the study area show that the fluid in quartz porphyry in late disseminated mineralization stage and quartz vein quartz of pota ssium silicate sulphide after magmatic stage is mainly magma water,which mainly reflec ts the inevitable relationship between early ore-forming fluid and magma system.Whether in sericite or lithology,the corresponding metal sulfide liquid will precipitate out of the atmosphere,react with the rock,and connect closely with the mineralization.The sulfur isotopes in the ore in this area are similar to those of mantle source on average,while the sulfur isotopes of granodiorite porphyry and mineralized vein metal are the same,in dicating that the sulfur sources are the same.Lead isotopes have been analyzed and the results of the results are that the mineral deposits are related to the mineral deposits,an d the lead isotopes in the granulin are basically stable and consistent,the same as the s ource of the source,and it has the same magma system which is based on a certain bas is.To sum up,the copper molybdenum in xinjiang is a shallow form of hot liquid min eral deposit,and it has been linked to the development of the late carbonite,which has a three stages,which is that the mineralization fluid came from the deep magma,and in the late period,the atmosphere water was added,and it was the result of the subductio n of the subduction.